linux-kernel - Re: drivres/hv

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Date:	Thu, 29 Nov 2012 10:13:17 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: drivres/hv

> All I know is that it is present and its size is known. If I have a way of knowing
> what range of mmio memory is unclaimed; I could grab that perhaps using
> the request_mem_region() call, I know the size that is reserved for this device.
> So, is there a way to query the system for the first unclaimed address in the mmio
> range.

You can add memory region resources yes. See the code in drivers/pci
which allocates mmio space to unassigned BARs and/or moves stuff around.

Alan
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